Connect a water flow sensor --> will M591 P7 work in Laser mode?
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Hello,
I plan to add a flow sensor to detect and monitor the water flow for the laser tube cooling.
Can I use it as a smart filament sensor like in printer mode to pause the execution when the flow gets to low?
Many Thanks in advance!
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@paulg4h
i have added my flow sensor (acting like a switch) on the E0 endstop with:M950 J1 C"!^E0STOP"then i activate a trigger (trigger2.g) when no flow is detected:
M581 P1 T2 S0 R0 -
Many thank's for your support, I will try it and report if its working for me too!
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@paulg4h
Eventually it is important which FW you use!My code is for RRF 3.3, i don't know if it works in earlier versions...
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@cosmowave
Which flow sensor to you use exactly?I use this one:
https://www.hobbytronics.co.uk/datasheets/sensors/YF-S201.pdfI also use the RRF in the latest beta version 3.3-RC3_2
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@paulg4h
My sensor is different to yours, because it is acting like a switch (only on or off). I don't know the correct word in english, internally is something like a floating body.Your sensor is measuring the flow like a tacho signal. So, i think you should write an other routine to detect your flow.
I think, the duet board has the possibility to read tacho signals... -
like the smart filament sensor for printers, but is this usable in laser mode too?
Which sensor to you use?
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@paulg4h said in Connect a water flow sensor in laser mode:
like the smart filament sensor for printers, but is this usable in laser mode too?
Why not? The filament sensor causes the printer to pause. It's your choice, what you put into the pause-macro.
Another option would be an thermistor to check water temp, but that's a slow reaction. -
@o_lampe
A temp sonsor will not be the best solution in case of a leak! -
I think a flow sensor and a thermistor would be the best solution, if any of them are triggered the laser should be pause the job.
Same for the lid switch.
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@o_lampe said in Connect a water flow sensor --> will M591 P7 work in Laser mode?:
@paulg4h said in Connect a water flow sensor in laser mode:
like the smart filament sensor for printers, but is this usable in laser mode too?
Why not? The filament sensor causes the printer to pause. It's your choice, what you put into the pause-macro.
Another option would be an thermistor to check water temp, but that's a slow reaction.The filament monitor code for laser, magnetic and pulse-generating sensors looks for differences between commanded and measured extrusion. So you can't use it for a laser because there is no extrusion.
OTOH you could configure a dummy fan with tacho, with your sensor connected to the fan tacho input. Then use the daemon.g file to monitor the tacho reading.
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@dc42
Many thanks, now I get the rpm from the sensor, but maybe you are so kind to tell me how to read the value in daemon.g and check if it is below a threshold and pause the machine in that case.http://192.168.199.203/rr_model?key=fans
returns:
{"key":"fans","flags":"","result":[{"actualValue":0,"blip":0.10,"max":1.00,"min":0.10,"name":"","requestedValue":0,"rpm":203,"thermostatic":{"heaters":[]}}],"next":0} -
@paulg4h
you should have a look to the object model for correct naming... i'm not at the machine...
But it will be something like this:if fans[n].rpm < xxx M25 -
@cosmowave
this is now my daemon.g contentif job.duration = null ; No job ignore sensor reading else ; Check Water Flow if fans[0].rpm < 100 G4 P10 if fans[0].rpm < 100 G4 P10 if fans[0].rpm < 100 M25 M118 S"No Water flow!" ; Check water temperature if sensors.analog[0].lastReading > 35 G4 P10 if sensors.analog[0].lastReading > 35 G4 P10 if sensors.analog[0].lastReading > 35 M25 M118 S"Water to hot!" -
Now even with three times reading the rpm and the delay the job pauses with the message no water flow.
How can I prevent this?
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@paulg4h
First: check if your rpm is > 100 -
@cosmowave this works now, many thanks!
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For everyone now the water flow sensor and even the water temperature monitored by RRF worked and pause the job when the water flow is to low or the water temperature is to high.
I use the YF-S201 as Flow Meter connected to the SKR 1.4T Board on the BLTouch Connector (servo and probe) pins. The thermistor is connected to the bed thermistor input also.
then I add in config.g
; Tools --> Laser Water Flow M950 F0 C"!fan0+^probe" ; Fan 0 uses the Fan0 output, but we are using a PWM fan so the output needs to be inverted, also we are using probe as a tacho input with pullup resistor enabled ; Tools --> Laser Water Temperature M308 S0 P"bedtemp" Y"thermistor" T100000 B4092 ; configure sensor 0 as thermistor on pin bedtempthen add the daemon.g file with this content too:
if job.duration = null ; No job ignore sensor reading else ; Check Water Flow if fans[0].rpm < 100 G4 P10 if fans[0].rpm < 100 G4 P10 if fans[0].rpm < 100 G4 P10 if fans[0].rpm < 100 M25 ; pause job M118 S"No Water flow!" ; write msg ; Check water temperature if sensors.analog[0].lastReading > 35 G4 P10 if sensors.analog[0].lastReading > 35 G4 P10 if sensors.analog[0].lastReading > 35 M25 ; pause job M118 S"Water to hot!" ; write msgMany thank's for all your help!
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@paulg4h
Thanks for sharing!
I'm just wondering, if there's a different way to code this (G4 P10)?
Eg. using a counter variable or iteration?
You can keep it like that, but if there's more code in daemon.g (for Lid control?) you don't want daemon.g to stick in a if-iteration with lots of G4.
